Pumping jack



April 3, 1934. R, AUSTIN 1,953,903

PUMPING JACK Filed Feb. 13, 1931 A TTORN E YS.

Patented Apr. 3, 1934 PATENT OFFICE PUMPING JACK Raymond L. Austin,Bradford, Pa., assignor to Bovaird & Seyfang Manufacturing Company,Bradford, Pa., a corporation of Pennsylvania Application February 13,1931, Serial No. 515,554

4 Claims.

Pumping jacks ordinarily provide a walking beam fulcrumed on a standingpost, or support, giving to the free end of the walking beam, which issecured to the polished rod, a curved path of travel. This isdetrimental in that it produces wear on the polished rod at the gland,or stuffing box, and thus results in leakage. The present invention isdesigned to modify the movement of the walking beam so that its free endmoves in practically a straight line and thus relieves the polished rodof side strain. Features and details of the invention will appear fromthe specification and claims.

A preferred embodiment of the invention is illustrated in theaccompanying drawing as follows:--

Fig. 1 shows a side elevation of the pump jack in place.

Fig. 2 a perspective view of the vertical member of the pumping jackrocker.

Fig. 3 a perspective View of the fulcrum connection between the walkingbeam and the standing post.

1 marks the well casing, 2 the tubing, 3 the stuffing box, and 4'thepolished rod. The walktwo channels, only one of which. is shown and fromthese channels extend the pipes 7 with braces 8 forming the standingpost. A pumping jack rocker 9 has trunnions 9a operating in bearings 10which are carried on blocks 11 secured to the base 6. An upright member12 has the usual brace 13 and the rocker is connected by a pitman 9bwith the walking beam. A pull rod 14 is secured by a strap 15 to theupright member in the usual manner.

A rocker connection 16 has a sleeve 17 at the bottom. Journal bolts 18extend through this sleeve and through caps 19 at the top of andconnecting the post 7 with the brace 8. A sleeve 20 is secured on thewalking beam and bolts 21 ex-' tend through the sides of the rockerconnections 16, the bolts forming a pivotal connection with the walkingbeam. The sleeve 20 has a channeled extension 22. A cap 23 is providedabove the extension 22 and bolts 25 pass through the cap and extensionand clamp these parts on the walking beam, the walking beam beingpreferably formed by parallel channels, as clearly shown in Fig. 3.

A forwardly extending arm 26 projects from the rocker connection 16 anda link 27 is connected with the free end of this arm by a bolt 28. Theopposite end of the link 27 is connected with an arm 29 on the uprightmember 12.- For this purpose, the arm 29 is provided with a slot 30 anda bolt 31 extends through the link and this slot, thus forming a pivotalconnection between the arm and the link. The slot affords a means bywhich the initial position and throw of the link may be adjusted.

The arm 29 is preferably formed in a casing which forms a spacing member32 between the side plates forming the upright member 12, these sideplates being secured on this spacing extension by bolts 33. The spacingportion 32 has perforations 34 through which bolts 35 extend, thesebolts securing a strap bearing 36. 7

In the operation of the device, as the upright member 12 swings towardthe rear to lift the walking beam and consequently the polished rod, thepath of the connection between the link and the arm 29 is toward therear and downwardly, swinging on the center of the trunnion 9a as acenter. The end of the link is so adjusted relatively to this that thismovement of the link gives to the arm 26 a downward movement andconsequently to the upper end of the fulcrum connection 16 a forwardmovement which will thrust the free end of the walking beam 4 at thetrunnion 5a toward the left a distance compensating approximately forthe deflection from the straight path that would otherwise take place byreason of the curved path of the end of the walking beam. In consequenceby this simple mechanism, the end of the walking beam is given anapproximately straight up and down movement, thus relieving the polishedrod of strain.

What I claim as new is:-

1. In a pumping jack, the combination of a post; a walking beamfulcrumed at the post; a pull rocker actuating the beam; a movablefulcrum connection between the post and the beam;

a link between the connection and rocker moving the connection toactuate the beam, said movement modifying the path of the free end ofthe beam; and an adjustable connection at one end of the link varyingthe relative movement of the rocker and the movable connection.

2. In a pumping jack, the combination of a post; a walking beamfulcrumed at the post; a pull rocker'actuating the beam; a movablefulcrum connection between the post and the beam; a link between theconnection and rocker moving the connection to actuate the beam, saidmovement modifying the path of the free end of the beam, said rockerhaving an arm extending theren from; and means for adjusting the link onsaid arm.

3. In a pumping jack, the combination of a post; a walking beamfulcrumed at the post; a pull rocker; a movable connection conveying thefulcrum thrusts from the beam to the post comprising a sleeve withconnecting arms; pivotal rods extending through the connecting arms andthe sleeve; a rock arm connected with the sleeve; and a link from therock arm to the rocker.

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